62 



HYDROIDA 



Eudendrium annulatum Normann. 



1864 Eudendrium annulatum, Norman, On undeseribed British Hydrozoa, Actinozoa, and Polyzoa, p. 



83, Pi- 9> f ig- r— 3- 



The strongly and irregularly branched colonies have a fascicled main stem, and attain a height 

 of 100 mm. All the smaller branches are densely annulated everywhere. The polyps have 16—20 

 tentacles. There are no particular accumulations of stinging cells on the tentacles or on the polyp 

 body, and the colony has no particular stinging organs. 



The gonophores are styloid. The male gonophores have one chamber with an accumulation of 

 stinging cells distally, and are densely grouped on short stalks perpendicularly placed on the stem. 

 The female gonophores have an unbranched spadix aud form grape-like clusters round polyps entirely 

 atrophied. 



Material: 



Greenland: Sukkertoppen (without particular data). 



Iceland: Vestmau Island, on the stems of Tubularia hidivisa. 



Eudendrium annulatum seems to occur rather sparsely, but apparently on the whole prefers 

 the littoral parts of the boreal seas. However, among the localities of the species are also recorded 

 the Cape Verde Islands (Quelch 1885), and with some doubt Cape Town (Ritchie 1907). On the 

 west coasts of Scandinavia the species has been met with here and there from Bohuslau as far as 

 Vadso, and it even occurs in the Murman Sea. It has been found near Jan Mayen and the Shetlauds, 

 and specimens occur from the south of Iceland and from West Greenland. 



Eudendrium capillare Alder. 

 1856 Eudendrium capillare, Alder, A notice of some new Genera and Species of British Hydroid Zoo- 

 phytes, p. 355, pi. 12, fig. 9—12. 



The strongly and irregularly branched colonies have a simple unfascicled main stem, and 

 attain a height of 30 mm. The branches show a few rings immediately above their rise. But else- 

 where they are smooth. The polyps have 20—30 tentacles. There are no particular accumulations of 

 stinging cells on the tentacles or on the polyps. The colonies have no particular stinging organs. 



The gonophores are styloid. The male gonophores have two chambers with an accumulation 

 of stinging cells distally, aud are placed in a whorl round entirely atrophied polyps or, more rarely, 

 round strongly reduced polyps, the stems of which rise from the hydrocaulus or the hydrorhiza. The 

 female gonophores occur in the same manner; they are pear-shaped with unbranched spadix. 



Material: 



Greenland: Store Hellefiskebanke . . . Depth 28 fath. 



Iceland: Stykkisholm . . . Depth 30 fath. 



The Faroe Islands: between Nolso and Gstnses . . . Depth 100 fath. 



The specimens from the "Store Hellefiskebanke" offer a great interest, the male gonophores 



